Simple Transient-Response Measurement Determines Power-Supply Bandwidth (.PDF Download)

It’s normal to assume that there’s an easy way to relate the bandwidth of a power-supply control loop to its transient response—no good reference exists that defines this in simple terms. It seems like a straightforward problem, which should have a simple solution. The higher the bandwidth, the faster the loop responds, and with less voltage deviation.

However, several limiting factors may get in the way of this simple relationship. The first one is the series resist

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